I went to get a quote on new stereo to be installed and the shop stated that I need to get $400 module with the new stereo so that it will work with my cars computer system? Is this normal?

I went to get a quote on new stereo to be installed and the shop stated that I need to get $400 module with the new stereo so that it will work with my cars computer system? Is this normal?

I sell that part for about $150 so $400 sounds steep. Its called a PAC OS-2Bose.

I went to get a quote on new stereo to be installed and the shop stated that I need to get $400 module with the new stereo so that it will work with my cars computer system? Is this normal?

What stereo are you going to go with? Price? Thanks :)

Walt